Granularity is pretty good for the Nightly builds, since a new update is normally built and pushed out at least once a day. The mozregression tool is useful for

Granularity is pretty good for the Nightly builds, since a new update is normally built and pushed out at least once a day. The mozregression tool is useful for narrowing down when a bug first appeared: http://mozilla.github.io/mozregression/ http://mozilla.github.io/mozregression/